3x=2.1求解方程急急快快快
人气：410 ℃ 时间：2019-11-26 08:10:54
解答
解由3x=2.1
两边除以3
即x=2.1÷3
即x=0.7解由0.7x=4.2两边除以0.7即x=4.2÷0.7即x=6.
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